{"id":31709,"date":"2023-10-07T22:03:44","date_gmt":"2023-03-22T03:18:24","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e7%9a%84%e5%8a%a8%e6%80%81mixin\/"},"modified":"2024-05-04T03:16:48","modified_gmt":"2024-05-03T19:16:48","slug":"%e5%9c%a8java%e4%b8%ad%e7%9a%84%e5%8a%a8%e6%80%81mixin","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8java%e4%b8%ad%e7%9a%84%e5%8a%a8%e6%80%81mixin\/","title":{"rendered":"\u5728Java\u4e2d\u7684\u52a8\u6001Mixin"},"content":{"rendered":"<p>\u5728Java\u4e2d\uff0c\u52a8\u6001\u5730\u8fdb\u884cMixin\uff0c\u800c\u65e0\u9700\u8fdb\u884c\u9ed1\u9b54\u6cd5\uff08\u5373\u4fee\u6539\u5b57\u8282\u7801\uff09\u3002<\/p>\n<h2>\u80cc\u666f<\/h2>\n<p>\u5728\u5b9e\u65bd\u4e2d\u95f4\u4ef6\u6a21\u5f0f\u7b49\u65f6\uff0c\u5f53\u6dfb\u52a0\u67d0\u4e2a\u4e2d\u95f4\u4ef6\u65f6\uff0c\u7ecf\u5e38\u5e0c\u671b\u5728\u8bf7\u6c42\u5bf9\u8c61\u4e2d\u589e\u52a0\u65b9\u6cd5\u3002<\/p>\n<p>\u5982\u679c\u8bd5\u56fe\u5728\u4e0d\u652f\u6301\u591a\u91cd\u7ee7\u627f\u7684Java\u4e2d\u5b9e\u73b0\u8fd9\u4e2a\uff0c\u6700\u7ec8\u5c06\u9700\u8981\u5b9e\u73b0\u6240\u6709\u5fc5\u8981\u65b9\u6cd5\u7684\u7c7b\uff08\u6216\u5176\u7236\u5b50\u5173\u7cfb\uff09\u3002<\/p>\n<p>\u53ea\u9700\u8981\u5fc5\u8981\u7684\u65b9\u6cd5\uff0c\u9700\u8981\u7684\u65f6\u5019\u518d\u6dfb\u52a0\u5c31\u597d\u4e86\u3002Mixin\uff01 Mixin\uff01<\/p>\n<h2>\u63a5\u53e3\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002<\/h2>\n<p>\u5bf9\u4e8e\u90a3\u4e9b\u5e0c\u671b\u5728Java\u4e2d\u5b9e\u73b0Mixin\u7684\u4eba\u4eec\u6765\u8bf4\uff0cJava8\u4e3a\u63a5\u53e3\u6dfb\u52a0\u4e86\u9ed8\u8ba4\u5b9e\u73b0\u7684\u529f\u80fd\u662f\u4e00\u4e2a\u5e94\u8be5\u53d7\u5230\u6b22\u8fce\u7684\u4e8b\u60c5\u3002<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Java8\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u5b9f\u88c5\u304b\u3089\u591a\u91cd\u7d99\u627f\u3068Mixin\u3092\u8003\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Java8\u3067mixin\u3092\u304c\u3093\u3070\u3063\u3066\u307f\u308b &#8211; yojik\u306elog<\/ul>\n<p>\u5982\u679c\u4fdd\u7559\u8fd9\u6837\u7684\u9ed8\u8ba4\u5b9e\u73b0\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">Traceable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Logger<\/span> <span class=\"no\">LOG<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">LoggerFactory<\/span><span class=\"o\">.<\/span><span class=\"na\">getLogger<\/span><span class=\"o\">(<\/span><span class=\"nc\">Traceable<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n\r\n    <span class=\"k\">default<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">writeLog<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"no\">LOG<\/span><span class=\"o\">.<\/span><span class=\"na\">info<\/span><span class=\"o\">(<\/span><span class=\"n\">toString<\/span><span class=\"o\">());<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u53ea\u9700\u5c06\u5176\u6dfb\u52a0\u5230\u5b9e\u73b0\u4e2d\uff0c\u65e5\u5fd7\u8f93\u51fa\u65b9\u6cd5\u5c31\u53ef\u4ee5\u4f7f\u7528\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">RequestImpl<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Request<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Traceable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toString<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">return<\/span> <span class=\"nf\">getParameters<\/span><span class=\"o\">().<\/span><span class=\"na\">toString<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"kd\">interface<\/span> <span class=\"nc\">Request<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Map<\/span><span class=\"o\">&lt;<\/span><span class=\"nc\">String<\/span><span class=\"o\">,<\/span> <span class=\"nc\">String<\/span><span class=\"o\">&gt;<\/span> <span class=\"nf\">getParameters<\/span><span class=\"o\">();<\/span>\r\n<span class=\"o\">}<\/span>\r\n\r\n<span class=\"nc\">Request<\/span> <span class=\"n\">req<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">RequestImpl<\/span><span class=\"o\">();<\/span>\r\n<span class=\"o\">((<\/span><span class=\"nc\">Traceable<\/span><span class=\"o\">)<\/span> <span class=\"n\">req<\/span><span class=\"o\">).<\/span><span class=\"na\">writeLog<\/span><span class=\"o\">();<\/span>\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u4e0d\u80fd\u4fdd\u6301\u72b6\u6001\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">interface<\/span> <span class=\"nc\">SessionAvailable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">private<\/span> <span class=\"nc\">Session<\/span> <span class=\"n\">session<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"k\">default<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setSession<\/span><span class=\"o\">(<\/span><span class=\"nc\">Session<\/span> <span class=\"n\">session<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">session<\/span> <span class=\"o\">=<\/span> <span class=\"n\">session<\/span><span class=\"o\">;<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u8fd9\u6837\u7684\u4e8b\u60c5\u662f\u4e0d\u53ef\u80fd\u7684\u3002<\/p>\n<p>\u5982\u679c\u8fd9\u4e2a\u5bf9\u8c61\u662f\u4e0d\u9700\u8981\u8003\u8651\u7ebf\u7a0b\u5b89\u5168\u7684\u5bf9\u8c61\uff0c\u90a3\u4e48\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u72b6\u6001\u5bb9\u5668\u7684\u529f\u80fd\u5982\u4e0b\uff0c\u8fd9\u6837\u53ef\u4ee5\u901a\u8fc7\u9ed8\u8ba4\u5b9e\u73b0\u5bf9\u72b6\u6001\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">Extendable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nc\">Object<\/span> <span class=\"nf\">getExtension<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"kt\">void<\/span> <span class=\"nf\">setExtension<\/span><span class=\"o\">(<\/span><span class=\"nc\">String<\/span> <span class=\"n\">name<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Object<\/span> <span class=\"n\">extension<\/span><span class=\"o\">);<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">SessionAvailable<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Extendable<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"k\">default<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">setSession<\/span><span class=\"o\">(<\/span><span class=\"nc\">Session<\/span> <span class=\"n\">session<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"n\">setExtensions<\/span><span class=\"o\">(<\/span><span class=\"s\">\"session\"<\/span><span class=\"o\">,<\/span> <span class=\"n\">session<\/span><span class=\"o\">);<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u52a8\u6001\u6df7\u5408<\/h2>\n<p>\u7531\u4e8e\u9ed8\u8ba4\u5b9e\u73b0\u7684\u5b58\u5728\uff0c\u53ea\u9700\u5728implements\u5173\u952e\u5b57\u540e\u5217\u51fa\u63a5\u53e3\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528\u8be5\u5b9e\u73b0\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u4f7f\u7528\u91c7\u7528\u4e2d\u95f4\u4ef6\u6a21\u5f0f\u5b9e\u73b0\u7684\u6846\u67b6\u7684\u4e00\u65b9\u6765\u8bf4\uff0c\u201c\u5728\u4f7f\u7528\u6b64\u4e2d\u95f4\u4ef6\u65f6\uff0c\u5fc5\u987b\u5b9e\u73b0\u6b64\u63a5\u53e3\u201d\u7684\u9650\u5236\u53ef\u80fd\u662f\u4e00\u4e2a\u56f0\u96be\u7684\u9650\u5236\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u6211\u4eec\u8003\u8651\u5728\u4e2d\u95f4\u4ef6\u4e2d\u81ea\u52a8\u5411\u8bf7\u6c42\u5bf9\u8c61\u6dfb\u52a0\u5fc5\u8981\u7684\u5b9e\u73b0\uff0c\u5e76\u4e14\u5728\u9700\u8981\u65f6\u80fd\u591f\u5904\u7406\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u8003\u8651\u5b9e\u73b0\u52a8\u6001Mixin\u7684\u529f\u80fd\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4e2d\u95f4\u4ef6\u5b9e\u73b0\u7684\u4f8b\u5b50\uff0c\u4f46\u662f\u5982\u679c\u4f7f\u7528\u65b9\u901a\u8fc7Mixin\u63a5\u53e3\uff0c\u5e76\u4f7f\u7528\u5176\u65b9\u6cd5\uff0c\u5c31\u4e0d\u9700\u8981\u63d0\u524d\u5b9e\u73b0Request\u5177\u6709SessionAvailable\u7684\u9700\u6c42\u3002<\/p>\n<pre class=\"post-pre\"><code>    <span class=\"nd\">@Override<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"no\">RES<\/span> <span class=\"nf\">handle<\/span><span class=\"o\">(<\/span><span class=\"no\">REQ<\/span> <span class=\"n\">req<\/span><span class=\"o\">,<\/span> <span class=\"nc\">MiddlewareChain<\/span> <span class=\"n\">next<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">final<\/span> <span class=\"no\">REQ<\/span> <span class=\"n\">request<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">MixinUtils<\/span><span class=\"o\">.<\/span><span class=\"na\">mixin<\/span><span class=\"o\">(<\/span><span class=\"n\">req<\/span><span class=\"o\">,<\/span> <span class=\"nc\">SessionAvailable<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">((<\/span><span class=\"nc\">SessionAvailable<\/span><span class=\"o\">)<\/span> <span class=\"n\">request<\/span><span class=\"o\">).<\/span><span class=\"na\">getSession<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"c1\">\/\/ .....<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u4f55\u5728Java\u4e2d\u52a8\u6001\u5730\u6dfb\u52a0\u63a5\u53e3\u5462\uff1f\u8fd1\u4e4e\u9ed1\u9b54\u6cd5\u7684\u767d\u9b54\u6cd5\u4ee3\u7406\uff0c\u53ef\u4ee5\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">Proxy<\/span><span class=\"o\">.<\/span><span class=\"na\">newProxyInstance<\/span><span class=\"o\">(<\/span>\r\n    <span class=\"n\">classloader<\/span><span class=\"o\">,<\/span>\r\n    <span class=\"k\">new<\/span> <span class=\"nc\">Class<\/span><span class=\"o\">[]{<\/span> <span class=\"nc\">Request<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">,<\/span> <span class=\"nc\">SessionAvailable<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span> <span class=\"o\">},<\/span>\r\n    <span class=\"k\">new<\/span> <span class=\"nf\">MixinProxyHandler<\/span><span class=\"o\">());<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u521b\u5efa\u4ee3\u7406\uff0c\u90a3\u4e48\u901a\u8fc7\u5728\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e2d\u6dfb\u52a0\u7684\u63a5\u53e3\u7684\u65b9\u6cd5\uff0c\u5c06\u7531\u7b2c\u4e09\u4e2a\u53c2\u6570\u4f20\u9012\u7684InvocationHandler\u8fdb\u884c\u5904\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">class<\/span> <span class=\"nc\">MixinProxyHandler<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"nc\">Object<\/span> <span class=\"nf\">invoke<\/span><span class=\"o\">(<\/span><span class=\"nc\">Object<\/span> <span class=\"n\">proxy<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Method<\/span> <span class=\"n\">method<\/span><span class=\"o\">,<\/span> <span class=\"nc\">Object<\/span><span class=\"o\">[]<\/span> <span class=\"n\">args<\/span><span class=\"o\">)<\/span> <span class=\"kd\">throws<\/span> <span class=\"nc\">Throwable<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">if<\/span> <span class=\"o\">(<\/span><span class=\"n\">method<\/span><span class=\"o\">.<\/span><span class=\"na\">getDeclaringClass<\/span><span class=\"o\">().<\/span><span class=\"na\">isAssignableFrom<\/span><span class=\"o\">(<\/span><span class=\"n\">original<\/span><span class=\"o\">.<\/span><span class=\"na\">getClass<\/span><span class=\"o\">()))<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"c1\">\/\/ \u5143\u306e<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"n\">method<\/span><span class=\"o\">.<\/span><span class=\"na\">invoke<\/span><span class=\"o\">(<\/span><span class=\"n\">original<\/span><span class=\"o\">,<\/span> <span class=\"n\">args<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span> <span class=\"k\">else<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"c1\">\/\/ \u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u5074\u306e\u30e1\u30bd\u30c3\u30c9\u306b\u30c7\u30a3\u30b9\u30d1\u30c3\u30c1<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nf\">getMethodHandle<\/span><span class=\"o\">(<\/span><span class=\"n\">method<\/span><span class=\"o\">)<\/span>\r\n                   <span class=\"o\">.<\/span><span class=\"na\">bindTo<\/span><span class=\"o\">(<\/span><span class=\"n\">proxy<\/span><span class=\"o\">)<\/span>\r\n                   <span class=\"o\">.<\/span><span class=\"na\">invokeWithArguments<\/span><span class=\"o\">(<\/span><span class=\"n\">args<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u65b9\u6cd5\u53e5\u67c4<\/h3>\n<p>\u73b0\u5728\u95ee\u9898\u5728\u4e8e\uff0c\u5f53\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528\u53cd\u5c04\u6765\u6267\u884c\u63a5\u53e3\u7684\u9ed8\u8ba4\u5b9e\u73b0\u65f6\uff0c\u539f\u59cb\u5bf9\u8c61\u5e76\u6ca1\u6709\u5b9e\u73b0\u6dfb\u52a0\u7684\u63a5\u53e3\uff0c\u56e0\u6b64\u65e0\u6cd5\u8fdb\u884c\u8c03\u7528\u3002<\/p>\n<p>\u4f7f\u7528MethodHandle\u800c\u4e0d\u662f\u4f20\u7edf\u7684\u53cd\u5c04\uff0c\u5373\u4f7f\u6ca1\u6709\u5b9e\u73b0\uff0c\u4e5f\u53ef\u4ee5\u8c03\u7528\u63a5\u53e3\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nc\">MethodHandles<\/span><span class=\"o\">.<\/span><span class=\"na\">lookup<\/span><span class=\"o\">()<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">in<\/span><span class=\"o\">(<\/span><span class=\"n\">declaringClass<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">unreflectSpecial<\/span><span class=\"o\">(<\/span><span class=\"n\">method<\/span><span class=\"o\">,<\/span> <span class=\"n\">declaringClass<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">bindTo<\/span><span class=\"o\">(<\/span><span class=\"n\">proxy<\/span><span class=\"o\">)<\/span>\r\n    <span class=\"o\">.<\/span><span class=\"na\">invokeWithArguments<\/span><span class=\"o\">(<\/span><span class=\"n\">args<\/span><span class=\"o\">);<\/span>\r\n<\/code><\/pre>\n<p>\u9ed8\u8ba4\u5b9e\u73b0\u53ef\u4ee5\u4f7f\u7528invokeSpecial\u6765\u8c03\u7528\u3002\u8981\u5b9e\u9645\u4f7f\u7528\uff0c\u9700\u8981\u66f4\u6539Accessibility\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u5bfc\u81f4\u67e5\u627e\u5931\u8d25\uff0c\u56e0\u6b64\u4f1a\u53d8\u5f97\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\u3002\u8bf7\u53c2\u8003\u4ee5\u4e0b\u5b8c\u6574\u4ee3\u7801\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u521b\u5efaMixin\u7684\u5b9e\u7528\u7a0b\u5e8f\uff0c\u5c31\u53ef\u4ee5\u52a8\u6001\u5730\u6dfb\u52a0\u63a5\u53e3\u5e76\u8c03\u7528\u5176\u5b9e\u73b0\u65b9\u6cd5\u3002\u8fd9\u771f\u662f\u592a\u65b9\u4fbf\u4e86\uff01<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">public<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">MixinUtilsTest<\/span> <span class=\"o\">{<\/span>\r\n    <span class=\"nd\">@Test<\/span>\r\n    <span class=\"kd\">public<\/span> <span class=\"kt\">void<\/span> <span class=\"nf\">mixin<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"nc\">Money<\/span> <span class=\"n\">m1<\/span> <span class=\"o\">=<\/span> <span class=\"k\">new<\/span> <span class=\"nc\">MoneyImpl<\/span><span class=\"o\">(<\/span><span class=\"mi\">5<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"n\">m1<\/span> <span class=\"o\">=<\/span> <span class=\"nc\">MixinUtils<\/span><span class=\"o\">.<\/span><span class=\"na\">mixin<\/span><span class=\"o\">(<\/span><span class=\"n\">m1<\/span><span class=\"o\">,<\/span> <span class=\"nc\">ComparableMoney<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">);<\/span>\r\n\r\n        <span class=\"n\">assertTrue<\/span><span class=\"o\">(<\/span><span class=\"nc\">ComparableMoney<\/span><span class=\"o\">.<\/span><span class=\"na\">class<\/span><span class=\"o\">.<\/span><span class=\"na\">cast<\/span><span class=\"o\">(<\/span><span class=\"n\">m1<\/span><span class=\"o\">).<\/span><span class=\"na\">isBigger<\/span><span class=\"o\">(<\/span><span class=\"k\">new<\/span> <span class=\"nc\">MoneyImpl<\/span><span class=\"o\">(<\/span><span class=\"mi\">3<\/span><span class=\"o\">)));<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">static<\/span> <span class=\"kd\">class<\/span> <span class=\"nc\">MoneyImpl<\/span> <span class=\"kd\">implements<\/span> <span class=\"nc\">Money<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kd\">private<\/span> <span class=\"kt\">int<\/span> <span class=\"n\">amount<\/span><span class=\"o\">;<\/span>\r\n\r\n        <span class=\"kd\">public<\/span> <span class=\"nf\">MoneyImpl<\/span><span class=\"o\">(<\/span><span class=\"kt\">int<\/span> <span class=\"n\">amount<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">this<\/span><span class=\"o\">.<\/span><span class=\"na\">amount<\/span> <span class=\"o\">=<\/span> <span class=\"n\">amount<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"nd\">@Override<\/span>\r\n        <span class=\"kd\">public<\/span> <span class=\"kt\">int<\/span> <span class=\"nf\">getAmount<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"n\">amount<\/span><span class=\"o\">;<\/span>\r\n        <span class=\"o\">}<\/span>\r\n\r\n        <span class=\"nd\">@Override<\/span>\r\n        <span class=\"kd\">public<\/span> <span class=\"nc\">String<\/span> <span class=\"nf\">toString<\/span><span class=\"o\">()<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nc\">Integer<\/span><span class=\"o\">.<\/span><span class=\"na\">toString<\/span><span class=\"o\">(<\/span><span class=\"n\">amount<\/span><span class=\"o\">);<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">Money<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"kt\">int<\/span> <span class=\"nf\">getAmount<\/span><span class=\"o\">();<\/span>\r\n    <span class=\"o\">}<\/span>\r\n\r\n    <span class=\"kd\">public<\/span> <span class=\"kd\">interface<\/span> <span class=\"nc\">ComparableMoney<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Money<\/span> <span class=\"o\">{<\/span>\r\n        <span class=\"k\">default<\/span> <span class=\"kt\">boolean<\/span> <span class=\"nf\">isBigger<\/span><span class=\"o\">(<\/span><span class=\"nc\">Money<\/span> <span class=\"n\">other<\/span><span class=\"o\">)<\/span> <span class=\"o\">{<\/span>\r\n            <span class=\"k\">return<\/span> <span class=\"nf\">getAmount<\/span><span class=\"o\">()<\/span> <span class=\"o\">&gt;<\/span> <span class=\"n\">other<\/span><span class=\"o\">.<\/span><span class=\"na\">getAmount<\/span><span class=\"o\">();<\/span>\r\n        <span class=\"o\">}<\/span>\r\n    <span class=\"o\">}<\/span>\r\n<span class=\"o\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u8bf7\u6ce8\u610f<\/h2>\n<p>\u76ee\u524d\u7684Java8 JVM\u5b9e\u73b0\u4e2d\uff0c\u901a\u8fc7MethodHandle\u8c03\u7528invokeSpecial\u975e\u5e38\u7f13\u6162\u3002\u6839\u636e\u5b9e\u6d4b\uff0c\u5b83\u7684\u6267\u884c\u65f6\u95f4\u901a\u5e38\u662f\u666e\u901a\u53cd\u5c04\u768410\u500d\u5230100\u500d\u3002\u56e0\u6b64\uff0c\u5728\u5b9e\u9645\u8fd0\u8425\u4e2d\uff0c\u9700\u8981\u91c7\u53d6\u5bf9\u9759\u6001Mixin\u8fdb\u884c\u4f18\u5316\u7b49\u6280\u5de7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728Java\u4e2d\uff0c\u52a8\u6001\u5730\u8fdb\u884cMixin\uff0c\u800c\u65e0\u9700\u8fdb\u884c\u9ed1\u9b54\u6cd5\uff08\u5373\u4fee\u6539\u5b57\u8282\u7801\uff09\u3002 \u80cc\u666f \u5728\u5b9e\u65bd\u4e2d\u95f4\u4ef6\u6a21\u5f0f\u7b49\u65f6\uff0c\u5f53\u6dfb\u52a0\u67d0\u4e2a [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-31709","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u5728Java\u4e2d\u7684\u52a8\u6001Mixin - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u7684\u52a8\u6001mixin\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5728Java\u4e2d\u7684\u52a8\u6001Mixin\" \/>\n<meta property=\"og:description\" content=\"\u5728Java\u4e2d\uff0c\u52a8\u6001\u5730\u8fdb\u884cMixin\uff0c\u800c\u65e0\u9700\u8fdb\u884c\u9ed1\u9b54\u6cd5\uff08\u5373\u4fee\u6539\u5b57\u8282\u7801\uff09\u3002 \u80cc\u666f \u5728\u5b9e\u65bd\u4e2d\u95f4\u4ef6\u6a21\u5f0f\u7b49\u65f6\uff0c\u5f53\u6dfb\u52a0\u67d0\u4e2a [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5728java\u4e2d\u7684\u52a8\u6001mixin\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-03-22T03:18:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-05-03T19:16:48+00:00\" \/>\n<meta name=\"author\" content=\"\u5b87, \u534e\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u5b87, \u534e\" \/>\n\t<meta name=\"twitter:label2\" 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